function [x,y,s] = mask(a,idx,orient,vals)

[xp,yp] = fm_draw('P','Pod',orient);
[xo,yo] = fm_draw('O','Pod',orient);
[xd,yd] = fm_draw('D','Pod',orient);

x = cell(4,1);
y = cell(4,1);
s = cell(4,1);

x{1} = [-1.8 4.1 4.1 -1.8 -1.8];
y{1} = [-1.5 -1.5 1.5 1.5 -1.5];
s{1} = 'k';

x{2} = 1.5*xp-0.7;
y{2} = 2*yp;
s{2} = 'r';

x{3} = 0.7+1.5*xo;
y{3} = 2*yo;
s{3} = 'r';

x{4} = 3.5+1.5*xd;
y{4} = 2*yd;
s{4} = 'r';

